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| Near space, airspace above the ground about 20-100 km, is higher than existing aircraft flight height and lower than existing low orbit satellite, including Stratosphere， mesosphere and part of ionosphere. Near space have some unique advantage, but currently still no effective development and application, while troposphere and low-orbit space is increasingly scarce. Near space SAR geometric model is similar with the aircraft SAR, but little difference brings completely different result. This paper discusses the near space new environment character and proposes that full aperture should be divided into subaperture to adapt new environment character. Then the novel subaperture technique is applied to Range Doppler Algorithm (RDA), and a sub-band combination technique is introduced to compose the subaperture images. Simulation results show that the proposed method indeed seems to be a promising solution to near space SAR imaging. |
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| Keywords:Near space; Subaperture image; Range Doppler Algorithm (RDA) |
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